Do you understand why we keep getting immigrants into the country? Simply put our economy would tank because we wouldn't have enough workers to do all the work needed, from fruit pickers to IT specialists and doctors.
If you don't want immigrants you need to fix the underlying issues. Low birth rates, poor education system and a broken healthcare system which has led to 6 million people of working age being unable to work. Instead the Tories have gone for austerity, and here we are. To be fair it goes back further than them, and before Blair and even before Thatcher.
Less immigrants won't make Britain better. It's an oversimplistic 'solution' that won't fix anything other than seeing less immigrants. That's why the tories lied to you. If you want less immigrants you need to fix all those other factors. And Brexit was never going to fix the immigrant problem, only the ones from the EU. Now we have more immigrants than ever from outside the EU.
And stop the boats is a smoke screen. We could start sinking the boats in the channel tomorrow, every single boat and you would not notice anything better about the British economy or even notice less immigrants. It's just a convenient issue for the government to campaign about, just the same as fishing rights during Brexit.